An Extra Stage level boss fight (8 nonspells, 8 standard spells, a timeout, and a "final spell" style attack) against a much, much more powerful version of Eternity Larva. Featuring the HSiFS playable cast with sub-season selection that determines one of the spell cards you face, plus a mysterious "Reimu EX" player who essentially acts as a bonus extra to check out after you have beaten the script proper.
Resourcing is fairly generous (adding up to a total of seven extra lives with three bombs per life, plus a bonus bomb per spell capture) but keep in mind that as an extra stage script the boss will not take damage from bombs during spell cards.
Credits:
ZUN: Touhou Project and all associated rights and assets. No claim to any such rights or assets is asserted by this script. Nobody on this site should need to read this.
Myself: Programming, design, and dialogue.
Kanashii a.k.a. MasterGameFTW3561: Initial script concept and music
https://www.youtube.com/channel/UCs0Iezm5CVy93EIRi_CTr0Q
Stormplush a.k.a. modkind: Eternity portrait and sprite
https://stormplush.tumblr.com/
MegamanOmega: Beta testing. Lots and lots of beta testing.
https://www.youtube.com/user/MegamanOmega184